Examples of com.amazonaws.services.dynamodb.datamodeling.DynamoDBMapper

Package com.amazonaws.services.dynamodb.datamodeling

Examples of com.amazonaws.services.dynamodb.datamodeling.DynamoDBMapper

com.amazonaws.services.dynamodb.datamodeling.DynamoDBMapper
Object mapper for domain-object interaction with DynamoDB.
To use, annotate domain classes with the annotations found in the com.amazonaws.services.dynamodb.datamodeling package. A minimal example:
```
 @DynamoDBTable(tableName = "TestTable") public class TestClass { private Long key; private double rangeKey; private Long version; private Set<Integer> integerSetAttribute; @DynamoDBHashKey public Long getKey() { return key; } public void setKey(Long key) { this.key = key; } @DynamoDBRangeKey public double getRangeKey() { return rangeKey; } public void setRangeKey(double rangeKey) { this.rangeKey = rangeKey; } @DynamoDBAttribute(attributeName = "integerSetAttribute") public Set<Integer> getIntegerAttribute() { return integerSetAttribute; } public void setIntegerAttribute(Set<Integer> integerAttribute) { this.integerSetAttribute = integerAttribute; } @DynamoDBVersionAttribute public Long getVersion() { return version; } public void setVersion(Long version) { this.version = version; } } 
```
Save instances of annotated classes to DynamoDB, retrieve them, and delete them using the {@link DynamoDBMapper} class, as in the following example.
```
 DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBClient); Long hashKey = 105L; double rangeKey = 1.0d; TestClass obj = mapper.load(TestClass.class, hashKey, rangeKey); obj.getIntegerAttribute().add(42); mapper.save(obj); mapper.delete(obj); 
```
When using the save, load, and delete methods, {@link DynamoDBMapper} willthrow {@link DynamoDBMappingException}s to indicate that domain classes are incorrectly annotated or otherwise incompatible with this class. Service exceptions will always be propagated as {@link AmazonClientException}, and DynamoDB-specific subclasses such as {@link ConditionalCheckFailedException}will be used when possible.
This class is thread-safe and can be shared between threads. It's also very lightweight, so it doesn't need to be. @see DynamoDBTable @see DynamoDBHashKey @see DynamoDBRangeKey @see DynamoDBAutoGeneratedKey @see DynamoDBAttribute @see DynamoDBVersionAttribute @see DynamoDBIgnore @see DynamoDBMarshalling @see DynamoDBMapperConfig

      if (hashKey == null)
        hashKey = getHashKey(obj);
      if (rangeKey == null)
        rangeKey = getRangeKey(obj);
      if (hashKey != null){
        DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBClient);
        if (rangeKey != null)
          mapper.load(persistentClass, hashKey.toString(), rangeKey.toString());
        else
          mapper.load(persistentClass, hashKey.toString());
          mapper.save(obj);
      }
      else
        throw new GoraException("Error while retrieving keys from object: " + obj.toString());
    }catch(NullPointerException npe){
      LOG.error("Error while putting an item. " + npe.toString());

View Full Code Here

  @Override
  public boolean delete(K key) {
    try{
      T object = null;
      Object rangeKey = null, hashKey = null;
      DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBClient);
      for (Method met :key.getClass().getDeclaredMethods()){
        if(met.getName().equals("getRangeKey")){
          Object [] params = null;
          rangeKey = met.invoke(key, params);
          break;
        }
      }
      for (Method met :key.getClass().getDeclaredMethods()){
        if(met.getName().equals("getHashKey")){
          Object [] params = null;
          hashKey = met.invoke(key, params);
          break;
        }
      }
      if (hashKey == null) object = (T) mapper.load(persistentClass, key);
      if (rangeKey == null)
        object = (T) mapper.load(persistentClass, hashKey);
      else
        object = (T) mapper.load(persistentClass, hashKey, rangeKey);


      if (object == null) return false;


      // setting key for dynamodbMapper
      mapper.delete(object);
      return true;
    }catch(Exception e){
      LOG.error("Error while deleting value with key " + key.toString());
      LOG.error(e.getMessage());
      return false;

View Full Code Here

    return new AlternatorDBClient();
  }


  @Bean
  public DynamoDBMapper mapper() {
    return new DynamoDBMapper(client());
  }

View Full Code Here


    private DynamoDBMapper mapper;


    private DynamoDBMapper createMapper()
    {
        return new DynamoDBMapper(getClient(), createMapperConfiguration());
    }

View Full Code Here

    protected DynamoDBMapper getMapper() {
        if (RUN_DB_AS_SERVICE) {
            return mapper;
        } else {
            if (inProcessMapper == null) {
                inProcessMapper = new DynamoDBMapper(getClient());
            }
            return inProcessMapper;
        }
    }

View Full Code Here

0 1

TOP

Related Classes of com.amazonaws.services.dynamodb.datamodeling.DynamoDBMapper

com.amazonaws.services.dynamodb.model.AttributeValue

com.amazonaws.services.dynamodb.model.AttributeValueUpdate

com.amazonaws.services.dynamodb.model.BatchGetItemRequest

com.amazonaws.services.dynamodb.model.BatchGetItemResult

com.amazonaws.services.dynamodb.model.BatchResponse

com.amazonaws.services.dynamodb.model.BatchWriteItemRequest

com.amazonaws.services.dynamodb.model.BatchWriteItemResult

com.amazonaws.services.dynamodb.model.DeleteItemRequest

com.amazonaws.services.dynamodb.model.DeleteRequest

com.amazonaws.services.dynamodb.model.ExpectedAttributeValue

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.